LEGO GBC Module: Mechanical Chain
Watch in 720 HD for best viewing
Here is a quick video of one of the GBC modules that I made, it is based off of akiyuky's Cup-to-Cup module (link below). I will be using this in my GBC layout, that will be finished soon!
Akiyuky's version: • LEGO GBC module : Cup to Cup レゴ カップ受け渡し型玉運び機